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JP2016516351

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DESCRIPTION JP2016516351
Abstract: Narrow shaped balanced subwoofers, or similar speakers, have a plurality of first set of
drivers facing one another located on the same plane on both sides, and a plurality of second set
of drivers facing in opposite directions Including drivers. These placements are such that the sum
of the forces from the first set of drivers and the sum of the forces of the second set of drivers
are equal, and therefore offset and center point or pivot The sum of moments from all drivers for
that is zero. The speakers may include more than two drivers and are symmetrically or
asymmetrically spaced. The drivers may be the same or different sizes, and the amplitude of the
audio signal may be adjusted to balance the speakers. Each of the set of drivers may output
sound into separate sound ducts, and may output sound from one or more openings.
Thin speaker
[0001]
The present invention relates to sound reproduction, in particular to the structure of a
loudspeaker and the housing.
[0002]
Many sound reproduction systems include subwoofer loudspeakers for reproducing very low
frequency audio signals.
Subwoofers are used in a variety of environments, including home audio systems, automotive
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sound systems, movie sound systems, home theater systems, and live performance sound
systems, among others.
[0003]
Despite these demands, conventional subwoofers suffer from a number of potential drawbacks or
disadvantages. For example, subwoofer speakers can occupy an excessively large space. The size
and shape of the subwoofer speaker cabinets can be difficult to install with limited viewing areas
or structural limitations, such as in cars and many home environments. Common subwoofer
cabinets are usually cubic in shape and may be difficult to install in speaker cabinets, cars, or
other confined spaces.
[0004]
The subwoofer's driver is relatively large in diameter compared to other drivers (eg, treble and
mid-tone areas) for optimal low-frequency sound reproduction, as well as drivers are common It
is common to have cones that are relatively deep in It is also common to configure a subwoofer
speaker enclosure with a large cavity to allow the driver sufficient capacity to move an adequate
amount of air. These considerations often cause huge design subwoofer cabinets that do not fit
easily in confined spaces.
[0005]
Another problem with subwoofer speakers is that the relatively large and powerful displacement
created by the subwoofer driver, which reproduces very low frequency sounds, causes the
subwoofer speaker to generate unwanted vibrations on nearby objects There is a possibility to
do. This phenomenon is not noticeable in stand-alone subwoofer speaker cabinets, but is
commonly manifested in houses designed as an integral part of large structures, or subwoofers
embedded in the walls of buildings, or subwoofers mounted on cars. Because these installed
subwoofers are in direct or indirect physical contact with the structure or frame of the car, other
products with low vibration contact with the structure or frame, or house / structure In adjacent
rooms, it causes noticeable rattling, forced movement of objects, and damage to objects.
Vibrations from the very low frequency reproduced by the subwoofer can easily pass through a
house or building while attenuating high frequencies, causing vibrations that can disturb the
quietness of the occupant or nearby.
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[0006]
Stand-alone subwoofer speaker cabinets can have similar problems. Stand-alone speaker cabinets
may be installed in unobtrusive or unobtrusive places, such as room corners or low cabinets, but
these excessive vibrations limit other functions ing. For example, an object placed on a standalone speaker enclosure makes a noticeable rattling noise and gradually slides or falls on the
surface, causing unpleasant noise or damaging the object.
[0007]
Some subwoofer speakers include two (or more) drivers to boost and output sound and, in some
designs, to reduce cabinet or enclosure vibration. When the two drivers are arranged facing each
other, the movement of the driver unit is symmetrical and the opposite movement of the two
drivers can be offset to reduce the vibration of the cabinet or the housing. However, one
drawback of this type of design is that the speaker cabinet, or housing, must be deep enough to
accommodate two opposing drivers, making it difficult to install in confined spaces It can cause
large cabinets or cases. Thus, consumers and sound system designers often have the choice of
allowing some level of cabinet / chassis vibration or finding an arrangement for large, huge
subwoofer loudspeakers I will leave it.
[0008]
It would be advantageous to provide a subwoofer with a narrow profile, or similar loudspeakers,
so that it can be used in smaller, narrower spaces. It would be further advantageous to provide a
subwoofer with reduced vibration while maintaining high levels of voice output and fidelity. It
would be further advantageous to provide a subwoofer suitable for use as a speaker embedded in
a home, in a building or in a car.
[0009]
In one aspect, the forces and / or moments generated by the movement of the driver are
substantially offset so that, among other things, the unwanted sound of the speaker housing or
housing is attenuated or dissipated A subwoofer, or other speaker, having a plurality of drivers
arranged and driven as provided is provided.
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[0010]
In one or more embodiments, the subwoofer or other speaker is a first set of drivers facing sideby-side installed side-by-side, and a second set of drivers facing the other Contains multiple
drivers.
The drivers are preferably such that the forces from the first set of drivers are equal in opposite
directions from the second set of drivers, with the sum of the vectors of forces from all the
drivers being zero. And the sum of the vectors of all driver moments with respect to the center
point is zero.
[0011]
The subwoofer, or other speaker, includes a minimum of three drivers to ensure that the moment
generated between the two opposing offset drivers can be offset by the addition of at least one
additional offset driver. May be. Subwoofers according to the particular principles described
herein, or other speakers, may include three, four, five, six or more drivers. The shape of the
subwoofer speaker may not be symmetrical and may be asymmetric such that the moment of
force cancels the center or center of gravity of the speaker. Similarly, the drivers are preferably
arranged in the same plane, but instead they are in a three-dimensional pattern such that the
forces and moments cancel against the center of gravity or center point of the speaker It may be
arranged.
[0012]
In some embodiments, the first set of drivers and the second set of drivers are coplanar but
facing away from each other. Each set of drivers may output to an adjacent slot or reflective
surface that directs the sound outward from the opening. The speaker housing may be
configured with a single aperture, or an aperture coupled to output from a common aperture to
both sets of drivers, to combine the sound from the two sets of drivers .
[0013]
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In a particular embodiment, the subwoofer, or other speaker, is comprised of a lightweight but
firm and robust housing formed of a frame whose walls are partially covered with an acoustically
opaque material. For example, the housing may be coated with an acoustically opaque material
arranged in a repeating pattern such as a honeycomb pattern, or comprised of a set of
superimposed support frames. Each driver, or set of drivers, may have it or its own separate
housing to prevent acoustic radiation to the rear of the driver (s) interfering with other drivers of
the loudspeaker .
[0014]
Further embodiments, alternatives and modifications are described herein and illustrated in the
accompanying drawings.
[0015]
FIG. 5 is a front view of one embodiment of a thin subwoofer having four drivers and a common
output opening.
It is a top view of the speaker of FIG. 1A. It is sectional drawing of the speaker of FIG. 1A. FIG. 2
is an exploded view of a thin subwoofer speaker constructed in accordance with the general
principles of FIGS. 1A-1C, shown in additional detail. FIG. 7 is a front view of an embodiment of a
thin subwoofer speaker with three drivers. FIG. 5 is a side view of an embodiment of a thin
subwoofer speaker having three drivers. FIG. 6 is a front view of an embodiment of a thin
subwoofer speaker having four drivers. FIG. 5 is a side view of an embodiment of a thin
subwoofer speaker having four drivers. FIG. 7 is a front view of another embodiment of a thin
subwoofer speaker having four drivers. FIG. 10 is a side view of another embodiment of a thin
subwoofer speaker having four drivers. FIG. 5A is a front view of an embodiment of a thin
subwoofer speaker having five drivers. FIG. 5 is a side view of one embodiment of a thin
subwoofer speaker having five drivers. FIG. 6A is a front view of an embodiment of a thin
subwoofer speaker having six drivers. FIG. 5A is a side view of an embodiment of a thin
subwoofer speaker having six drivers. FIG. 7 is a front view of another embodiment of a thin
subwoofer speaker having six drivers. FIG. 5A is a front view of an embodiment of a thin
subwoofer speaker having eight drivers. FIG. 7 is a side view of one embodiment of a thin
subwoofer speaker having eight drivers. FIG. 7 is a simplified diagram illustrating force and
moment cancellation for a speaker having four drivers operating in accordance with
embodiments disclosed herein.
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[0016]
According to one or more embodiments, the loudspeaker housing is selectively driven such that
the reaction forces and moments of the magnet generated by the movement of the driver are
substantially offset, arranged in different directions. Alternatively, a subwoofer speaker system
with multiple drivers is provided that reduces or eliminates unwanted vibration of the housing.
[0017]
According to one embodiment, the subwoofer speaker comprises a first set of drivers facing in
one direction and a second set of drivers facing in the opposite direction, the first set of drivers
and the second The sets of drivers are co-planar so that the depth of the speaker housing or
housing is reduced.
The cone of each driver, or the diaphragm moves back and forth, and the driver pushes the cone
or diaphragm forward, and the first force applied to the frame of the driver or the speaker
housing that supports the chassis or the first applied to the housing Generate a second force
equal to one but opposite. Drivers placed diametrically opposite one another can, if at
equilibrium, produce forces that cancel one another, as a result of which the vibrations are
damped. However, the driver installed out of the center of gravity or center point of the speaker
housing or housing tends to generate a rotational force, in other words related to the reaction
force of the magnet that can cause unwanted vibrations It tends to generate attached moments.
[0018]
In order to reduce or eliminate such vibrations, the driver preferably not only has the sum of the
forces from the first set of drivers equal to the opposite of the sum of the forces of the second set
of drivers. Set and arrange so that the sum of vectors of moments from the driver with respect to
the center of gravity or center point is zero in total.
[0019]
The subwoofer speaker of the embodiments disclosed herein may include any number of drivers,
for example, generated between two conflicting offset drivers to offset forces and moments
between drivers. It is expected to use a minimum of three drivers so that the moments being
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performed can be offset by the addition of at least one additional offset driver.
The subwoofer speaker may include more than two drivers in either a symmetrical or
asymmetrical arrangement, preferably, but not necessarily, aligned in the same major plane.
[0020]
Furthermore, in at least some embodiments, the driver outputs sound towards the output slot, or
a reflector that diverts and directs the sound from adjacent to the output opening outwards. The
speaker housing may be configured with an opening coupled to the two openings of the driver to
combine the two sets of sounds and output from a common opening to both a single opening or a
driver set.
[0021]
A thin subwoofer speaker 100 configured in accordance with an embodiment disclosed herein is
described in FIGS. 1A-1C. FIG. 1A is a front view of a thin subwoofer speaker 100 (as described
below, not showing a front acoustical reflective cover), and FIGS. 1B and 1C are a top view and a
side view of the speaker 100, respectively. . As shown therein, the speaker 100 in this example
includes four drivers 105a, 105b, 110a, 110b provided in the main speaker housing 120. The
speaker housing 120 of this example includes a first baffle 130 having a hole for installing two
drivers 105a and 105b and a second baffle 131 having a hole for installing two drivers 110a and
110b. Including. A first pair of drivers 105a, 105b is provided in the opposite direction from the
second pair of drivers 110a, 110b, all four drivers 105a, 105b, 110a, 110b being provided in the
same plane 135 . That is, the cones of the drivers 105a, 105b, 110a, 110b overlap although they
do not point in the same direction. The first pair of drivers 105 a, 105 b is preferably provided
symmetrically on both sides of the center of the speaker housing 120. On the other hand, the
second pair of the drivers 110a and 110b is similarly provided symmetrically with respect to the
center of the speaker housing 120 by providing them symmetrically on either side of the drivers
105a and 105b.
[0022]
The first baffle 130 and the second baffle 131 form opposing walls of the main speaker housing
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120, and in this example, the main speaker housing 120 is further divided into four chambers. ,
Four chambers include two outer chambers 136, 137 and two inner chambers 138, 139. The
four chambers 136-139 preferably acoustically separate so that some movement of the drivers
105a, 105b, 110a, 110b does not interfere with adjacent drivers during speaker operation. More
specifically, the four chambers 136-139 are provided such that the backward acoustic reflection
from any of the drivers 105a, 105b, 110a, 110b does not interfere with the other drivers. The
main speaker enclosure 120 may also include a top wall 160, a bottom wall 161 (as in FIG. 1C),
and side walls 162, 163 (as in FIG. 1B) to form a complete enclosure. Good. The size of the
chambers 136-139 is preferably selected to allow for proper movement of the drivers 105a,
105b, 110a, 110b. In particular, the width between the first baffle 130 and the second baffle
131 allows the coils 107a, 107b of the drivers 110a, 110b to vibrate without contacting the first
baffle 130, and of the drivers 105a, 105b. It enables the coils 106 a, 106 b to vibrate without
contacting the second baffle 131.
[0023]
Therefore, the width of the speaker housing 120 can be made much thinner than, for example, a
speaker provided with two drivers facing each other, as needed. In this case, the thickness has to
cover not only the size of the two drivers but also the range of movement of the coils of both
drivers.
[0024]
Although not necessary in all embodiments, in the example of the speaker 100, the main speaker
housing 120 includes a cabinet top wall 150, a cabinet bottom wall 151, a cabinet back wall 140,
and a cabinet front panel 141. To define the various sound ducts so that the external structure
allows the sound to be output directly from the top sound opening 155 and the bottom sound
opening 156 described below, it is spaced from the main speaker housing 120 It is open and
enclosed. The external speaker cabinet may be shared with the side walls 162, 163 of the main
speaker housing 120, and may be structurally connected to the main speaker housing 120 via
the columns 157, 158.
[0025]
In operation, the drivers 105a, 105b, 110a, 110b output sound towards the rigid acoustic
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reflector, each time the acoustic output turns 90 ° towards the output opening. More
specifically, the first pair of drivers 105a, 105b outputs sound towards the first rigid plate
constituting the speaker cabinet rear wall 140, and the second pair of drivers 110a, 110b is the
speaker housing The sound is output toward the second rigid plate constituting the body front
panel 141. The mounting baffle 130 and the speaker cabinet rear wall 140 collectively define a
narrow sound duct 145 which urges the acoustic output in the direction of 90 ° relative to the
first pair of drivers 105a, 105b. On the other hand, the mounting baffle 130 and the speaker
enclosure front panel 141 collectively define a narrow sound duct 146 which urges the acoustic
output in the direction of 90 ° as compared to the second pair of drivers 110a, 110b. In this
particular design, the outputs from the drivers 105a, 105b are oriented 90 ° twice so that
acoustic energy exits the rear sound duct 145, flows forward, and exits the top sound opening
155 and bottom sound opening 156. Change. Similarly, the sound output from the drivers 110a,
110b, which has passed through the front sound duct 146, causes the sound from all four drivers
105a, 105b, 110a, 110b to exit the top sound opening 155 and the bottom sound opening 156
To exit through the top sound opening 155 and the bottom sound opening 156.
[0026]
In the embodiment of FIGS. 1A-1C, the vibration is effectively reduced or eliminated if the same
signal of the same intensity is supplied to all four drivers 105a, 105b, 110a, 110b. Their relative
motion can offset various forces and moments. This effect is a simplification of the basic
loudspeaker design of FIGS. 1A-1C, and 10, which showed the cancellation of the opposing
moments generated by the simultaneous forces applied to the four drivers 105a, 105b, 110a,
110b. This can be clarified with reference to FIGS. 5A and 5B which show the same. 5A and 5B
particularly show the effect when the four drivers 105a, 105b, 110a, 110b are given equal
signals of the same intensity. As is well known to those skilled in the art, a typical driver includes
a cone or diaphragm that is attached to every frame or chassis and has a coil attached to its back
side. The suspension system associated with the driver, like the piston, allows the coil to move
back and forth in the gap. The electrical audio signal provides magnetic energy to the cone or to
the coil, which in turn vibrates back and forth on the diaphragm, on the frame of the driver or
the speaker housing supporting the chassis or on the frame or chassis transmitted to the housing
Generate the opposite force. The driver's suspension system provides a restoring force that
returns the cone and diaphragm to a neutral position after movement.
[0027]
In this example, the forward motion of the drivers 105a, 105b creates a "lowering" motion
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(according to FIG. 5B) on the speaker housing or speaker housing 120. On the other hand, the
forward movement of the drivers 110a, 110b produces a "rising" movement on the speaker
housing or speaker housing 120. Assuming that each driver 105a, 105b, 110a, 110b is driven by
the same signal, and each driver 105a, 105b, 110a, 110b has the same physical and electrical
characteristics, the speaker housing or the speaker The downward force on the housing 120
cancels the upward force so that the vibration is reduced or canceled. A similar phenomenon is
that when the restoring force of the suspension system moves the driver cone or diaphragm
backward from the reference position, the restoring force of the drivers 105a, 105b is generated
to offset the restoring forces of the drivers 110a, 110b.
[0028]
Drivers 105a, 105b, 110a, 110b are more preferably positioned and positioned to totally cancel
the moments generated by the forces associated with the back and forth movement. This
phenomenon is described with reference to FIG. The center point or center of gravity of the
speaker housing 120 is shown in association with the position of the drivers 105a, 105b, 110a,
110b. Each of the drivers 105a, 105b, 110a, 110b is physically offset from the center point and
produces a moment that causes it to move. In general, the moment of each driver is equal to the
outer product r × F of vectors. Where r is the vector from the center point in question to the
driver's center of gravity, and F is the force generated by the driver. In this example, the drivers
105a, 105b, 110a, 110b are substantially the same plane 135 across the center point, and the
force F is generally perpendicular to the plane of the driver, so the vector outer product is the
distance between the driver and the center point And the force F vector product. However, if the
drivers are not on the same plane, the various moment estimates will instead use the outer
product of the vectors. There is no unique condition in which all the drivers are arranged on the
same plane.
[0029]
In the example of FIG. 10, drivers 105a and 105b assume distance A from the center point, and
drivers 110a and 110b assume distance B from the center point. From the examination given to
the symmetrical arrangement of the driver, the moment M1 generated by the movement of the
driver 110a is -B × F which cancels the moment M4 = B × F generated by the movement of the
driver 110b, and the movement of the driver 105a It can be seen that the moment M2 generated
by is equal to -A.times.F which cancels the moment M3 = A.times.F generated by the movement
of the driver 105b. The moments of the drivers 105a, 105b facing one another cancel each
other, and the moments of the drivers 110a, 110b facing the other one cancel each other.
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[0030]
Thus, the arrangement of FIG. 10 not only completely offsets the upward and downward forces
generated by the drivers 105a, 105b, 110a, 110b, but also the carefully selected drivers 105a,
105b, 110a, 110b. The rotational arrangement of the drivers 105a, 105b, 110a, 110b is likewise
offset by the symmetrical arrangement of As a result, it is not necessary to split pairs of drivers
facing each other, and the loudspeaker 100 substantially reduces vibrations despite multiple
spaces between the linearly arranged drivers.
[0031]
In fact, if necessary, a slight adjustment may be made in consideration of the deviation of the
center of gravity of the driver 105a, 105b, 110a or 110b from the center plane 135 passing
through the center point and / or the arrangement asymmetric to each other. It is also good.
Such adjustments may be, for example, in the form of changing the size of the driver or coil
(since the output of the driver is directly proportional to the moving mass), or changing the mass,
or changing the electrical audio signal provided to the driver It may be.
[0032]
FIG. 2 shows a slight variation of the thin subwoofer speaker shown in FIGS. 1A-1C from various
points of view. In FIG. 2, the reference number "2xx" corresponds to the same reference number
"1xx" in FIGS. 1A-1C. Thus, the speaker 200 in FIG. 2 includes four drivers 205a, 205b, 210a,
210b arranged linearly. Two drivers 205 a and 205 b are provided in the first baffle 230 of the
main speaker housing 220. The other two drivers 210 a, 210 b are provided on the second baffle
231 of the main speaker housing 220. The first pair of drivers 205a, 205b outputs sound
towards the first acoustic reflector 240 (which may be the back wall of the speaker). On the other
hand, the second pair of drivers 210a, 210b outputs sound toward the second acoustic reflector
241 (which may be the front panel of the speaker). The main speaker housing 220 includes a
speaker housing frame 290 in the general shape of a rectangular box in this example, and is
connected to the main speaker 220 via a set of columns 257, 258 to support the bottom frame
member 251 And a second edge supporting the top frame member 250 (the top and bottom are
optionally defined in this case, the loudspeaker 100 being arranged like a driver in a side-to-side
arrangement), Part of a larger speaker cabinet. The bottom of the speaker housing frame 290 is
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attached to the speaker back panel 240.
[0033]
In this particular example, additional speaker frame components may be provided with
mechanical support, assists, aesthetics. For example, the top / bottom speaker frame assembly
285 can be attached to the top and bottom of the speaker 200, and the side speaker frame
assembly 280 can be attached to both sides of the speaker 200. Top / bottom speaker frame
assembly 285 may include longitudinal supports 295, 296 connected by cross support 297.
Meanwhile, the side speaker frame assembly 280 may include vertical supports 291 and 292
connected by the cross support 293. The speaker housing frame 290 can be constructed of a
light and hard material such as aluminum, other metals, other alloys, or other suitable materials,
while the top / bottom speaker frame assembly 285 and the side The speaker frame assembly
280 can be constructed of wood, plastic, synthetic materials, potential metal components (such
as supports 297 or 293), or reinforcements.
[0034]
The same idea as above preferably applies to speakers with different numbers of drivers that can
be arranged symmetrically or asymmetrical, and drivers of different arrangements, as long as the
forces about the center of gravity or around the center and the moment cancels out. It can apply.
Also, the driver does not have to be all the same size, but can select different sizes that match the
effect of the magnitude of the output generated by the driver. Similarly, although it is not
necessary for the signals of the same strength to be applied to each driver, some drivers receive
signals of amplified or reduced strength that affect the magnitude of the output generated by the
drivers. It is also good.
[0035]
3A-3B, 4A-4B, 6A-6B, 7A-7B, or 8, 9A-9B all apply the inventive concepts disclosed herein. The
various types of possible loudspeaker designs and driver arrangements are shown. For example,
FIGS. 3A and 3B are front and side views, respectively, of another embodiment of a thin
subwoofer speaker 300, wherein three linearly arranged drivers 305, 310a and 310b are used.
Prepare. In the present embodiment, a single driver 305 is provided on the first baffle 330 of the
speaker 300. On the other hand, the other two drivers 310 a, 310 b are provided in the second
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baffle 331. Similar to the embodiment of FIGS. 1A-1C, all three drivers 305, 310a, 310b are
located on the same lateral plane 335, but the first driver 305 facing in one direction is a
loudspeaker It is located at the center of the center point 309 of 300. On the other hand, the
other two drivers 310 a and 310 b facing in the opposite direction as compared with the first
driver 305 are symmetrically arranged at a distance D on both sides from the center point 309.
Although not explicitly shown, each of the drivers 305, 310a, and 310b is preferably acoustically
separated from the perspective of rear acoustic radiation from the other via a separate subchamber in the housing of the speaker ing.
[0036]
The size of the driver 305, 310a, 310b (hence the moving mass) and / or the amplitude of the
respective audio signal is preferably such that the force F generated by the first driver 305
points in the opposite direction It is selected to be twice the force F / 2 generated by the pair of
drivers 310a and 310b. As a result, the force of the first driver 305 offsets the sum of the forces
generated by the pair of drivers 310a, 310b facing in the opposite direction. In order to achieve
this, the coils of the drivers 310a, 310b and the mass of the moving parts can for example be
chosen to be half the mass of the coils of the driver 305 and the moving parts, as a result of the
drivers 310a, 310b The generated force is half of the generated force of the driver 305.
Alternatively, the drivers 310a, 310b may be the same size as the driver 305, but receive an
audio drive signal that is attenuated in amplitude compared to the audio drive signal received by
the driver 305, and thus attenuated. To the force. Specifically, generally generated force F = m ×
A, where m = moving mass of coil and other components, A = acceleration, adjustment of driver's
acceleration through change of signal strength is , Adjust the generated force of the driver. In this
case, the amplitude of the signal for the drivers 310a, 310b is selected as the displacement of the
drivers 310a, 310b when half of the displacement of the driver 305 is moved, resulting in half of
the generated force.
[0037]
Alternatively, the force generated by the drivers 310a, 310b can be adjusted to be half the force
of the driver 305 by the moving coil, or a combination of reduced mass of components, and the
signal of the damping amplitude However, in this case, the calculation is somewhat complicated.
[0038]
Similarly, the moments generated by all the drivers 305, 310a, 310b of the loudspeaker 300
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cancel so that the sum of the moments is equal to zero.
Because driver 305 is disposed along the central axis of speaker 300 passing through center
point 309, driver 305 has a moment of zero. The drivers 310a and 310b each produce a moment
equal to D × F / 2, but opposite in sign since they are on the opposite side of the center point
309. Thus, the moments generated by the drivers 310a and 310b cancel each other and the sum
of all the moments reaches zero.
[0039]
Thus, in the loudspeaker 300 of FIGS. 3A and 3B, the sum of the forces of all the drivers 305,
310a, 310b cancels out to zero in total, and the sum of moments also cancels to zero.
[0040]
Another embodiment of a thin subwoofer speaker is described in FIGS. 4A and 4B, where a front
view and a side view are shown, each showing a speaker 400 with four drivers.
In FIGS. 4A and 4B, the speaker 400 comprises a first pair of drivers 405a, 405b provided on a
first baffle 430. Meanwhile, two drivers 410 a and 410 b provided on the second baffle 431 of
the speaker 400 are provided. The four drivers 405a, 405b, 410a, 410b of this example are
arranged symmetrically in a substantially square pattern. The first pair of drivers 405a, 405b is
placed across one diagonal 436 of the square and the other pair of drivers 410a, 410b is placed
across the other diagonal 437 of the square, but with four drivers 405a, 405b, 410a, 410b are
located on the same lateral surface 435. Although not explicitly shown, each of the drivers 405a,
405b, 410a and 410b is preferably acoustically in terms of rear acoustic radiation from the other
via a separate sub-chamber in the housing of the loudspeaker It is separated.
[0041]
The size of the drivers 405a, 405b, 410a, 410b (hence the moving mass), and the amplitude of
the respective audio signals, may all be identical, such that the forces F generated by the
respective drivers are identical. As a result, the sum of the forces generated by the first pair of
drivers 405a, 405b offsets the sum of the forces generated by the second pair of drivers 410a,
410b facing in the opposite direction, all forces Will be zero. Similarly, the moments generated
03-05-2019
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by all the drivers 405a, 405b, 410a, 410b of the loudspeaker 400 cancel so that the sum of all
the moments is zero. The drivers 405a, 405b each generate a moment equal to D × F with
respect to the diagonal 436, but the two are opposite to each other because they are located on
the opposite side of the center point 409. Thus, the moments generated by the drivers 405a and
405b cancel each other. Similarly, drivers 410a and 410b each generate a moment equal to D ×
F with respect to diagonal line 437, but both have opposite signs since they are located on the
opposite side of center point 409. Thus, the moments generated by the drivers 410a and 410b
cancel each other and the sum of all the moments reaches zero.
[0042]
Thus, in the speaker 400 of FIGS. 4A and 4B, the sum of the forces of all the drivers 405a, 405b,
410a, 410b cancels out to zero in total, and the sum of moments also cancels to zero.
[0043]
It should be noted that the speaker designs of FIGS. 4A-4B and 5A-5B utilize four drivers but also
have different arrangements of drivers.
Nevertheless, in any case, using the design principles disclosed herein, the sum of all driver
forces is zero, and the sum of moments generated by all drivers is zero. The speaker is
configured.
[0044]
Front and side views are shown, respectively, of a speaker 600 in which a thin subwoofer
speaker according to yet another embodiment comprises five drivers 605, 610a, 610b, 610c,
610d in FIGS. 6A and 6B. In the design of FIGS. 6A and 6B, the speaker 600 includes a first driver
605 provided in the first baffle 630 and four drivers 610a, 610b, 610c provided in the second
baffle 631 of the speaker 600. , 610d set. In this example, a single driver 605 provided on the
first baffle 630 is centrally located. On the other hand, the four drivers 610a, 610b, 610c, 610d
are arranged symmetrically in a substantially square pattern, and one pair of the drivers 610a,
610d is arranged across one diagonal 636 of the square, the driver 610b, While the other pair of
610c is disposed across the other diagonal 637 of the square, all five drivers 605, 610a, 610b,
610c, 610d are located in the same lateral plane 635. Although not explicitly shown, each of the
drivers 605, 610a, 610b, 610c, 610d is preferably acoustically in terms of rear acoustic emission
03-05-2019
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from the other via a separate sub-chamber in the housing of the loudspeaker Are separated.
[0045]
The size of the drivers 605, 610a, 610b, 610c, 610d (hence the moving mass) and / or the
amplitude of the respective audio signal is preferably in the opposite direction, the force F
generated by the first driver 605 Are chosen to be four times the force F / 4 generated by the set
of drivers 610a, 610b, 610c, 610d facing. As a result, the force of the first driver 605 offsets the
sum of the forces generated by the set of drivers 610a, 610b, 610c, 610d facing in the opposite
direction. In order to achieve this, the coils of the drivers 610a-610d and the mass of the moving
parts can for example be chosen to be 1/4 of the mass of the coils of the driver 605 and the
moving parts, so that the driver 610a, The generated force of each of 610 b, 610 c, 610 d is 1⁄4
of the generated force of the driver 605. Alternatively, the drivers 610a, 610b, 610c, 610d
receive and attenuate an audio drive signal of the same size as the driver 605 but with reduced
amplitude compared to the audio drive signal received by the driver 605. Leading to
Alternatively still, the force generated by the drivers 610a, 610b, 610c, 610d is one-fourth the
force of the driver 605 due to the combination of the movable coil or the reduced mass of the
component and the signal of the damping amplitude. So can be adjusted.
[0046]
Similarly, the moments generated by all the drivers 605, 610a, 610b, 610c, 610d of the
loudspeaker 600 cancel so that the sum of the moments is equal to zero. Since the driver 605 is
disposed along the central axis of the speaker 600 (on the central point 609), its moment is zero.
The drivers 610a, 610d each generate a moment equal to D × F / 4 with respect to the diagonal
636, but the two are opposite to each other since they are located on the opposite side of the
center point 609. Thus, the moments generated by drivers 610a and 610d cancel each other.
Similarly, drivers 610 b and 610 c each generate a moment equal to D × F / 4 with respect to
diagonal line 637, but they are opposite in sign since they are located on the opposite side of
center point 609. Thus, the moments generated by the drivers 610b and 610c cancel each other,
and the sum of all the moments reaches zero.
[0047]
Thus, in the loudspeaker 600 of FIGS. 6A and 6B, the sum of the forces of all the drivers 605,
610a, 610b, 610c, 610d cancels out to zero in total, and the sum of moments also cancels to
zero.
03-05-2019
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[0048]
Another embodiment of a thin subwoofer speaker is shown in FIGS. 7A and 7B, a front view and a
side view, respectively, of a speaker 700 having six drivers.
In the design of FIGS. 7A and 7B, the loudspeaker 700 comprises a first set of drivers 705 a, 705
b, 705 c provided in the first baffle 730 and a driver 710 a provided in the second baffle 731 of
the loudspeaker 700. , 710b, and 710c. The six drivers 705a, 705b, 705c, 710a, 710b, 710c of
this example are arranged symmetrically in a substantially hexagonal (more generally circular)
pattern, and the first of the drivers 705a, 705b, 705c. Sets are generally arranged in an
equilateral triangle shape, and the other sets of drivers 710a, 710b, 710c are similarly arranged
in an equilateral triangle shape to offset the first equilateral triangle (ie, two positive triangles).
Although the apexes of the triangles indicate opposite directions), the six drivers 705a, 705b,
705c, 710a, 710b, 710c are located in the same lateral plane 735. Although not explicitly shown,
each of the drivers 705a, 705b, 705c, 710a, 710b, 710c is preferably in terms of rear acoustic
emission from the other via a separate sub-chamber in the housing of the speaker, It is
acoustically separated.
[0049]
The size of the drivers 705a, 705b, 705c, 710a, 710b, 710c (hence the moving mass) and the
amplitude of the respective audio signal may be identical as the force F generated by the
respective driver. As a result, the sum of forces generated by the first set of three drivers 705a,
705b, 705c is the sum of the forces generated by the second set of drivers 710a, 710b, 710c
facing in the opposite direction. And offset all at zero. Similarly, the moments generated by all the
drivers 705a, 705b, 705c, 710a, 710b, 710c of the loudspeaker 700 cancel so that the sum of all
the moments is zero. Preferably, the loudspeaker 700 is hexagonal in shape, or to avoid residual
moments generated by the asymmetry of the six relative square drivers 705a, 705b, 705c, 710a,
710b, 710c of the loudspeaker 700. It is round. For simplicity, such residual moments are
ignored as they can be eliminated by making the shape of the loudspeaker 700 symmetrical for
each driver. In any case, x-y coordinates are selected as shown in FIG. 7A, and the outer product
of the vectors a × b = (a 2 b 3 −a 3 b 2, a 3 b 1 −a 1 b 3, a 1 b 2 −a 2 b 1), a moment M1 = (−
D, 0,0) × F generated by the driver 705b offset by a sum of moments, and a moment M4
generated by the driver 710a = (D, 0,0) × − If F is evaluated, then the force F = (0, 0, f), and the
moment sums to (0, 2D · f, 0): M2 = (D · cos 60 °, D · sin 60 °, 0) × (0, 0, f), M3 generated by
03-05-2019
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the driver 705a = (D · cos 60 °, −D · sin 60 °, 0) × (0, 0, f), M5 = generated by the driver 705c
(−D · cos 60 °, D · sin 60 °, 0) × (0, 0) −f), M6 = (D · cos 60 °, −D · sin 60 °, 0) × (0, 0,
−f) generated by the driver 710 b, where F = (0, 0) generated by the driver 710 c , F) are thus
forces perpendicular to the loudspeaker 700 which are not in the xy plane.
[0050]
The four moments generated by drivers 705a, 705c, 710b and 710c are determined as follows:
M2 = (Df sin 60 °, -D f cos 60 °, 0), driver 705a M3 = (− D · f · sin 60 °, −D · f · cos 60 °, 0)
generated by the M5 = (− D · f · sin 60 °, −D · f · cos 60 ° generated by the driver 705c , 0), M
6 = (D · f · sin 60 °, −D · f · cos 60 °, 0) generated by driver 710 b, generated by driver 710 c
and the sum of these vectors is: ((2 · D · f · sin 60 ° −2 · D · f · sin 60 °), −4 · D · f · cos 60 °,
0) = (0, −4/2 D · f, 0) = (0, −2 D · f , 0) this is Specifically, the driver 705b and the sum of the
moments generated by 710a are clearly countered and offset.
[0051]
Thus, in the loudspeaker 700 of FIGS. 7A and 7B, the sum of the forces of all the drivers 705a,
705b, 705c, 710a, 710b, 710c sum to zero, as well as the moment to zero.
[0052]
Another embodiment of a thin subwoofer speaker is shown in FIG. 8 with a front view of a
speaker 800 with six drivers.
In the design of FIG. 8, the speaker 800 comprises a first pair of drivers 805a, 805b provided in
the first (top) baffle and four other provided in the second (bottom) baffle of the speaker 800b. It
comprises drivers 810a, 810b, 810c, 810d, which show a cross-sectional view similar to that of
the loudspeaker 300 shown in FIG. 3B (and thus not shown as another view in FIG. 8).
The first two drivers 805a, 805b of this example are arranged symmetrically with respect to the
center point 809 and the set of four drivers 810a, 810b, 810c, 810d, which are likewise facing in
opposite directions, substantially All of the six drivers 805a, 805b, 810a, 810b, 810c, 810d,
810d are in the same lateral direction as viewed from the side, as in the previous embodiment.
Located in the plane (as in Figure 3B). Although not explicitly shown, each of the drivers 805a,
805b, 810a, 810c, 810d is preferably acoustically in terms of rear acoustic emission from the
other via a separate sub-chamber in the housing of the speaker Are separated.
03-05-2019
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[0053]
The size of the drivers 805a, 805b, 810a, 810b, 810c, 810d (hence the moving mass) and / or
the amplitude of each audio signal is preferably generated by the first pair of drivers 805a, 805b
Force F is selected to be twice the force F / 2 generated by the set of drivers 810a, 810b, 810c,
810d facing in the opposite direction. As a result, the sum of the forces of the first pair of drivers
805a, 805b offsets the sum of the forces generated by the set of drivers 810a, 810b, 810c, 810d
facing in the opposite direction. In order to achieve this, the coils of each of the drivers 810a,
810b, 810c, 810d and the mass of the movable part may for example be half the mass of the coil
of either of the drivers 805a, 805b and the movable part, Alternatively, even if all the drivers
have the same size, it is selected whether the drivers 810a, 810b, 810c, 810d receive an audio
drive signal whose amplitude is attenuated compared to the audio drive signal received by the
drivers 805a, 805b. can do. As described above in connection with FIGS. 3A-3B, or alternatively,
some combination of moving mass and changes in audio signal conditioning may cause the force
to be properly tuned.
[0054]
Similarly, the moments generated by all the drivers 805a, 805b, 810a, 810b, 810c, 810d of the
loudspeaker 800 cancel so that the sum of the moments is equal to zero. In this case, because
they are arranged symmetrically, the moments generated by the drivers 805a, 805b offset
against the center point 809, and the moments generated by the drivers 810a, 810b are the
moments generated by the drivers 810b, 810c. And offset, leading to a moment of zero.
[0055]
Thus, in the speaker 800 of FIG. 8A, the sum of the forces of all the drivers 805a, 805b, 810a,
810b, 810c, 810d cancels out to zero in total, and the moments cancel out to zero as well.
[0056]
In one form, the loudspeaker 800 of FIG. 8 can be regarded as two loudspeakers 300 of FIGS. 3A3B arranged adjacent to one another, and using similar principles, larger loudspeaker structures
are compared The design of large, more complex subwoofer speakers can be estimated.
03-05-2019
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[0057]
It should be noted that the speaker designs of FIGS. 7A-7B and 8 utilize six drivers but also have
different arrangements of drivers.
Nevertheless, in this case, using the design principles disclosed herein, a speaker such that the
sum of all driver forces is zero and the sum of moments generated by all drivers is zero
Configured
[0058]
Another embodiment of a thin subwoofer speaker is shown in FIGS. 9A and 9B, a front view and a
side view, respectively, of a speaker 900 comprising eight drivers.
9A and 9B, the speaker 900 is provided in a first set of four drivers 905a, 905b, 905c, 905d
provided in a first baffle 930 and in a second baffle 931 of the speaker 900. Another set of four
drivers 910a, 910b, 910c, 910d is provided. The first set of drivers 905a, 905b, 905c, 905d are
arranged in a substantially square and symmetrical pattern with respect to the center point 909,
with four drivers 910a, 910b, 910c, facing in opposite directions. The other set of 910d is
similarly arranged in a substantially square and symmetrical pattern with respect to the center
point 909, all eight drivers 905a-905d, 910a-910d being in the same lateral plane. It is located
at 935. Although not explicitly shown, the drivers 905a-905d, 910a-910d are preferably
acoustically separated from the perspective of rear acoustic radiation from the other via a
separate sub-chamber in the housing of the speaker There is. Here, the square patterns of the
four drivers are offset by 90 ° from one another, but this is not a requirement, and the square
patterns are enclosed by the outer squares of the four drivers in sync. It may be arranged as a
square inside the number of drivers.
[0059]
The size (and hence the moving mass) of the drivers 905a-905d, 910a-910d, and the amplitude
of the respective audio signal may be identical as the force F generated by the respective driver.
As a result, the sum of forces generated by the first set of drivers 905a-905d offsets the sum of
the forces generated by the second set of drivers 910a-910d facing in the opposite direction, all
03-05-2019
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at zero. .
[0060]
Similarly, due to the symmetrical arrangement in this particular design, the moments generated
by all the drivers 905a-905d, 910a-910d of the loudspeaker 900 cancel so that the sum of the
moments is zero. The drivers 905a and 905c respectively generate moments equal to A × F but
cancel because they are opposite in sign; the drivers 905b and 905d also respectively generate
equal moments A × F but cancel because they are opposite in sign; driver 910a and 910d each
generate a moment equal to B × F but cancels because the signs are opposite; and drivers 910b
and 910c each generate a moment equal to B × F but cancels since the signs are opposite.
[0061]
Thus, in the loudspeaker 900 of FIGS. 7A and 7B, the sum of the forces of all drivers 905a-905d,
910a-910d sums to zero, as well as the moment to zero.
[0062]
According to one or more embodiments as disclosed herein, the balanced subwoofer, or other
speaker, optionally has a relatively narrow shape, thus only providing advantages in terms of
placement Instead, vibration, rattling noise, etc. are reduced, and the viewing experience is
improved.
The speaker is preferably balanced such that vibrations, rattling etc. are eliminated or at least
attenuated below an acceptable level so that the force generated by the driver is sufficiently
offset. For example, the driver may be arranged such that the sum of forces associated with the
driver is less than a first threshold and the sum of moments associated with the driver is a
second threshold, the first And the second threshold is selected within the tolerance of the given
vibration and rattling noise. More preferably, the drivers have substantially zero sums of forces
associated with all drivers, and the sum of moments from all drivers relative to the center of
gravity or center point of the loudspeaker is substantially zero. It is arranged as it is. As a result,
the sum of forces or moments is substantially equal to zero when causing vibrations, rattling and
the like that are insufficient for ordinary audiences and observers to recognize.
03-05-2019
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[0063]
Subwoofers, or other similar speakers, for example, in various embodiments, many drivers
arranged side-by-side coplanar are in a first set facing in one direction, and in the opposite
direction A second set may be included. In such a case, the drivers are directed such that the sum
of the forces from all the drivers is equal to zero. That is, the sum of forces from the first set of
drivers may be arranged to be equal and in the opposite direction to the sum of forces from the
second set of drivers. Then, the sum of the moments from all the drivers with respect to the
center of gravity or center point of the speaker is equal to zero as a whole.
[0064]
Subwoofers according to some principles described herein, or other speakers may include any
driver, and at least three drivers used in some embodiments have two opposite directions The
moment generated between the offset drivers facing is offset by the addition of at least one
additional offset driver. For example, the subwoofer or other speaker may include three, four,
five, six or more drivers. The shape of the loudspeakers need not be symmetrical and can be
asymmetric as long as the forces and moments cancel out with respect to the center point and
the center of gravity of the loudspeakers. Similarly, the drivers are preferably coplanar, but can
be arranged in a three dimensional pattern as long as the forces and moments offset the center
point of the loudspeaker. The drivers are all arranged in a single linear array, but may
alternatively (preferably, but not necessarily) be arranged symmetrically to the center of gravity
of the loudspeaker. Even and odd drivers can be used, as long as the forces and moments are
preferably balanced for the rattle and damped vibrations of the loudspeaker.
[0065]
In one embodiment, the first set of drivers and the second set of drivers are co-planar but
oriented in opposite directions. Each of the set of drivers outputs sound towards the plane of the
reflection direction, as well as directing sound outward from the adjacent slot or opening. The
speaker enclosure is composed of a single aperture, or an aperture coupled to output from a
common aperture to both sets of drivers, combining the sound from the two sets of drivers It is
also good.
[0066]
03-05-2019
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In a particular embodiment, the subwoofer, or other speaker, is constructed of a lightweight but
stiff and sturdy enclosure whose walls are partially constructed of an overlay frame of an
acoustically opaque material. For example, the housing may include an acoustically opaque
material, such as a resilient foam, arranged in a repeating pattern, such as a honeycomb pattern,
or a set of supporting frames overlaid with such other materials. Can.
[0067]
Inside the speaker enclosure, each driver (or set of drivers) has its own enclosure (or theirs) so
that the driver's back acoustic reflection does not interfere with the sound output of other drivers
It may be
[0068]
The embodiments disclosed herein can be used for a variety of applications, and in particular it is
desirable to hide the speakers from view, and the audio system can, for example, be in the
arrangement or location of the speakers. Suitable for situations facing restrictions.
A thin balanced subwoofer speaker is constructed in accordance with the embodiments disclosed
herein, and can be installed, for example, on a wall, ceiling or floor of a building, and also relative
to a car, further reducing high power and vibration. Can be used in situations where it is used for
extremely narrow speakers. In a particular embodiment, the array of opposing drivers is provided
in a pair of baffles forming part of a speaker enclosure, and still in the same plane, the first set of
drivers in the first sound duct The sound is output and the second set of drivers output the sound
to the second sound duct. The sound duct as in the embodiment may have one or more common
output openings connected such that both sets of drivers output sound from the same one or
more openings.
[0069]
In any of the embodiments described herein, the loudspeakers utilized in the sound system may
be passive or active in nature (including built-in or on-board amplification functions). The various
audio channels can be individually amplified, level shifted, boosted, or otherwise individually
adjusted speakers or pairs of speakers appropriately. In some embodiments, audio signal (s) to
03-05-2019
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various drivers may be processed and / or delayed, for example, to ensure that sound waves
generated in the audio output of each speaker are stronger than the other Or the other can be
adjusted that way. Subwoofers, or other speakers may be connected with other devices, such as
tweeters, and add a balanced driver to further improve the sound quality experienced by the
audience, especially these are very It produces a small or minimal force, so it has an effect that
the vibration of the speaker housing can be ignored. The configuration of the loudspeakers can
advantageously be used in homes, buildings, cars, soundproofing stages, musical instrument
amplifiers etc., and it is advantageous or desirable for any application to be thin loudspeakers.
[0070]
Although the preferred embodiments of the present invention have been described herein, many
variations are possible within the concept and scope of the present invention. Such variations will
become apparent to those skilled in the art after inspection of the specification and drawings.
Accordingly, the invention is not to be restricted except within the spirit and scope of any
appended claims.
[0071]
This application claims the benefit of US Provisional Patent Application No. 61 / 780,521, filed
Mar. 13, 2013, which is incorporated herein by reference in its entirety. Incorporated into
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